As the game develops, it is not un-expected that some upgrades will cost the price of the upgrade. It is not the same as buying that upgrade as if it were a stand-alone purchase.
Kinda like buying MSOffice 2010. You can buy it alone and pay big bucks, or buy the upgrade for less .... IF.... IF... you have the previous model. Either way, a new "player" could buy the older model and NOT have to buy the new one at a high price.
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